Bo7'nean Species q/'Opisthostonia. 271 



5. Opisthostoma Hosei^ Godwin-Austen. 



Opisthostoma Hosei, G.-A., Ann. & Mag. Nat. Hist. 1890, vol. vi. 

 p. 246, p]. vii. fig. 2. 



Hah. Baram district, North Sarawak. 



6. Opisthostoma mirahile, Smith. 



Opisthostoma mirabile, Smith, Journ. Linn. Soc, Zool. 1893, vol. xxiv. 

 p. 346, pi. XXV. figs. 11, 11a; id. Science Gossip, 1894, vol. i. p. 6 

 (cut). 



Hab. Gomanton Hill, North Borneo. 



7. Opisthostoma Everetti, Smith. 



Opisthostoma Everetti, Smith, Journ. Linn. Soc, Zool. 1893, vol. xxiv. 

 p. 346, pi. XXV. figs. 12, 12 a. 



Hab. Jambusan, south-west end of Sarawak. 



8. Opisthostoma jucu7idum, Smith. 

 Opisthostoma jucundum, Smith, op. cit, p. 347, pi. xxv. figs. 13, 13 a. 



Hab. Mantanani Island, off British North Borneo. 



9. Opisthostoma baritense. Smith. 

 Opisthostoma baritense, Smith, op. cit. p. 347, pi. xxv. figs. 15, 15 a. 

 Hab. Barit Mountain, North-west Borneo. 



10. Opisthostoma busanense, Smith. 

 Opisthosto7na busanense, Smith, op. cit. p. 348, pi. xxv. tigs. 16, 16 n, 

 Hab. Busan, south-west end of Sarawak. 



11. Opisthostoma otostOTtia^ Boettger. 



Opisthostoma otostoma., Boettger, Nachrichtsbl. deutsch. mal. Gesell. 

 1893, p. 194. 



Hab. Brunei, North-west Borneo. 



12. Opisthostoma Cookei. 



Testa conica, perforata, paUide rufescens ; spira subtihter concave 

 conica, ad apicem obtusiuscula ; anfractus 6-7, superiores convexi, 

 Iseves, inferiores minus convexi, oblique et tenuissime lameUati, 

 ultimus ad peripheriam obtuse angulatus, antice constrictus, 

 retroversus, ascendens, conspicue solutus, lamelUs vaUdioribus 

 distantioribus bicristatis ornatus ; apertura rotundata, intus 



